The only thing those rifles have in common with ACTUAL SPRs and MK18s is the barrel length. Calling a rifle with a 10.3" barrel a Mk18 is as accurate as calling a Colt 6921 an "M4". Pure thread-bait marketing.
Couldn't you have just said: "A duel between the 18" SS barrel and a 10.5" CL barrel captured in HD"?

